It’s possible, I’d guess likely, that you’ve been able to get work done well in spite of no cameras.
Of course, I doubt anyone would do an experiment to see if your statement is true or not.
I just thought that your statement seemed so absolute but the evidence you present isn’t.
We're not getting work done "in spite of" no cameras. We're getting work done, period, and don't have to deal with the fatigue of having a webcam on all the time.
But I disagree with you because I think they are important and useful.
Combining them into a single statement with an and is what makes the disagreement.
Perhaps you could get even more work done with cameras on when communicating with people.
Just feeling fatigue doesn’t seem like a reason to turn off cameras. I feel fatigue from working, yet I do it.